Device for use in connection with the drawing of glass cylinders.



F. M. FRANCARI. DEVICE FOR USE IN C(JNNECTION WITH THE DRAWING 0F GLASS CYUNDERS.

APPLICATION FILZD APR. H, NIB. 1 ,272,652. Patented Ju1y16,1918.

UNITED STATES PATENT OFFICE.

FERNAND M. FRANCART, or SPRINGDALE, PENNSYLVANIA.

DEVICE FOR USE IN CQNNECTION WITH THE DRAWING OF GLASS CYLINDERS.

Specification of IlZ-etters Patent.

Patented Jul 16, 1918.

Application filed April 17, 1918. erial No. 91,779.

To all whom it may concern:

Be it known that I FERNANoM. FRAN- CART, a citizen of the United States, and residentof Springdale, in the county of Allegheny and'State of Pennsylvania, have invented a new and useful Improvement in Devices for Use in Connection with the Drawing of Glass Cylinders; and I do hereby declare the followlngto be a full, clear,

and enact description thereof.

My inventlon relates to a device for use in connectlon with the drawing of glass cylin- "ders.

In the drawing of lass cylinders for the manufacture of win ow-glass, the method mostcommonly employed consists in lowermg a bait into the body of molten glass, withdrawing the bait so that the glass adhering thereto is formed into the shapeof a cyhnder, sufiicient air bein admitted to hold the glass in cylinder orm. In'the practice of this method, difiiculties have arisen due to the impurities in the glass,

and which are drawn up in the formation of the cylinder, and which result in imper- '-fections in the glass,-and the production of glass of poor qualit The object of my invention is to provide the impurities which collect upon the sur ace of the glass within the drawing area and so provide a practicall pure glass for the cylindergthereby greatly improving the qual ty of the glass.

A further object of my invention is to provide a simple means for the disconnecting of the blown cylinder from the body of molten glass.

To'these ends my invention consists,"generally stated, inproviding means for depressing the glass around the drawing area, whereby the surface of the lass is lowered around the drawing area and the impurities flow to this depressed portion, and means for trapping the impurities outside the drawing area, thereby leaving the glass practically pure in the drawing area from which the glass is drawn to form the cylinder.

My invention further consists in protectting the lower-end of the cylinder from the heat of the furnace during the drawing operation and withdrawing such protection when the cylinder is drawn so that the heat of furnace melts ofi the lower end of said cylinder and diseonnects it from the molten mass of glass.

In the accompanying'drawmg, Figural 1s a sectional view of a portion of a tank showing my improved device, in raised position, and also in vertical section; Fig. 2 1s a like view showing the device lowered in osition for use; Fig. 3 is an enlarged detail 5 owing the manner in which the glass is depressed; Iiig. l is a like view with the device inpositlon during the drawing operation; and Fig. 5 is a section on the line 5&5, Fig. 1.

In the drawing, the numeral 2 designates a suitable tank or pot containing the molten glass3. This pot or tank has the openin 4 through which the drawing operation taiies place, and within spid opening. I insert the device 5, which is preferably circular in form and formed of fire-clay or other suitable refractory material. The device 5 is provided with the central passage (ithrough which the cylinder is drawn and through which the bait is raised and lowered. 7

At the lower end of the device 5 is the skirt 7, which projects below the body of the device, and inside said skirt is the ringportion 8, which formsbetween said ringportion and said skirt the recess or trap 9.

This skirt portion may be formed separate from the main body of'the device, so that when it is worn out it may be replaced by a new portion. f

The device 5 is raised -.and lowered by m'eans'of the chains 10', which pass around the pulley 11, and are connected to the links 12 at opposite sides of the device, said links being connected to the eyelets 13. In this lowered throu h the o enin 4. and when.

the skirt v7 stri es the surface of the molten glass, the glass will be depressed, as indicated in Fig. 3, for it will be understood that the glass has such viscosity that the skirt will not at once sink into the glass, but will tend first to depress the same so that the glass contained within the area of the device will flow toward the skirt, and as the impurities are carried on the surface of the glass, these impurities will 'flow toward'the skirt, and upon furtherlowering of the device, the skirt Will sink down into the body of glass and the ring 8 will likewise be submerged, the imthe pure glass becomes attache purities being trapped within the space 9, as indicated in Fig. l. If'desired, vents me be formed in the skirt 7 which will permit the air trapped" in the space 9 to escape as well as the impurities. The bait 14 is then lowered in the ordinary manner down through the opening 4, and the glass in the drawin area mclosed b the device becomes attache to the bait in t e ordinary manner, and the glassis drawn up to form the cylin- It will be observed that by my device the impurities which were floating upon' the lass at'the drawing area are floated ofl bein the bait is lowered,conseguently, only 'to the bait, and the drawing of the cylinder takes place fro'mthe purified area; As soon as the top surface containingthe impuritiesis floated off, the glass below is practically pure in uality and the cylinder 15 made up of practically pure glass, and a finer quality of glass isobtained. 5 I

Furthermore, when the device is lowered into the glass, as indicated in Fig. 2, it proteets the cylinder from the heat of the furnace durm the drawing operation.

And when t e cylinder is drawn by lifting said device above the molten glass as indlcated by dotted lines, Fig. I, the heat of the furnace will'melt ofl the lower end of the cylinder and free it from the mass of molten pressed into the glass aroun'dthe drawing area whereby the surface intpurities flow from the drawing area toward said depression, and means on said device for trapping the impurities outside the drawing area.

- 2. A device for use in connection with the drawing of glass cylinders having a passage extending. through it, a skirt'at the lower end thereof, and an inside ring-portion above the lower end of said skirt and forming between said ring and said skirt a trap or recess.

In testimony whereof, I the said FERNAND M. FRANGART, have hereunto set my hand.

FERNAND M. FRANCART.

Witnesses:

M. J. E. SWAIN, M. J. Swans. 

